Fig. 1: Block diagram of the broadband random OEO.

LD, laser diode; MZM, Mach–Zehnder modulator; WDM, wavelength division multiplexer; DCF, dispersion compensation fiber; EDFA, erbium-doped fiber amplifier; PD, photodetector; EA, electrical amplifier. Angled cleaving is used at the fiber end facets.